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QRFP/Pth4 hypothalamic neurons

Candidate: concept label1 source documents6 linked claims
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Aliases

Pth4 neurons, QRFP/Pth4 neurons

Extracted Explainers

What the tool is doing

This source describes QRFP/Pth4-expressing hypothalamic neurons as a sleep-promoting population in zebrafish. Their stimulation increases sleep and is proposed to act through hindbrain monoaminergic neurons.

Source 1DOIPubMed

Resources required

Interrogating this population in the paper required optogenetic stimulation plus genetic epistasis and cell ablation approaches. The abstract also indicates dependence on downstream monoaminergic circuit components.

Source 1DOIPubMed

What problem it solves

It helps fill the gap that few hypothalamic neuronal populations regulating sleep had been identified. The paper positions these neurons as a new entry point for dissecting hypothalamic control of vigilance state.

Source 1DOIPubMed

What it does not solve

The abstract does not resolve which specific pth receptor is functionally required in each downstream branch. It also does not provide a full mechanistic account of how each downstream target mediates sleep promotion.

Source 1DOIPubMed

Alternatives

The abstract contrasts this sleep-promoting population with distinct wake-promoting hypothalamic populations. It also states that qrfp is coexpressed but not required for the optogenetically induced sleep effect.

Source 1DOIPubMed

Evidence Snippets

Here, we describe a sleep-promoting population of hypothalamic neurons that expresses the neuropeptides QRFP and parathyroid hormone 4 (Pth4) in zebrafish.
Evidence 1Source 1DOIPubMedprovenance

Supporting Sources

Linked Claims

Claim 1causal perturbation effectsupports2026Source 1DOIPubMed

Optogenetic stimulation of QRFP/Pth4 neurons causes a large increase in sleep in zebrafish.

Quoted textsource-backed
Optogenetic stimulation of these neurons results in a large increase in sleep
Claim 2circuit modelsupports2026Source 1DOIPubMed

Distinct sleep- and wake-promoting hypothalamic populations act through hindbrain monoaminergic neurons to control vigilance state.

Quoted textsource-backed
These results identify QRFP/Pth4 neurons as a novel hypothalamic sleep-promoting population and support a model in which distinct sleep- and wake-promoting hypothalamic populations act via monoaminergic neurons in the hindbrain to control vigilance state.
Claim 3functional rolesupports2026Source 1DOIPubMed

QRFP/Pth4-expressing hypothalamic neurons are a sleep-promoting neuronal population in zebrafish.

Quoted textsource-backed
Here, we describe a sleep-promoting population of hypothalamic neurons that expresses the neuropeptides QRFP and parathyroid hormone 4 (Pth4) in zebrafish.
Claim 4genetic dependencysupports2026Source 1DOIPubMed

The sleep increase induced by optogenetic stimulation of QRFP/Pth4 neurons requires pth4 but not qrfp.

Quoted textsource-backed
Optogenetic stimulation of these neurons results in a large increase in sleep that requires pth4 but not qrfp.
Claim 5genetic interactionsupports2026Source 1DOIPubMed

Pth4 neuron-induced sleep is suppressed in stk32a mutants, possibly through stk32a-expressing prethalamic neurons that express pth receptors.

Quoted textsource-backed
Pth4 neuron-induced sleep is also suppressed in serine/threonine kinase 32a (stk32a) mutants, possibly via stk32a-expressing neurons in the prethalamus that express pth receptors.
Claim 6pathway dependencysupports2026Source 1DOIPubMed

Pth4 neuron-induced sleep is suppressed when noradrenaline is absent in locus coeruleus neurons or when serotonergic raphe nuclei are absent.

Quoted textsource-backed
genetic epistasis and cell ablation experiments revealed that Pth4 neuron-induced sleep is suppressed in mutants that lack noradrenaline in the LC or lack the 5HT RNs.